package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * @Author: @Weiney
 * @ClassName: DishServiceImpl
 * @Description: 菜品服务层实现类
 * @Create: 2025-01-18
 **/

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Transactional // 多表操作
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish); // 将DishDto对象属性拷贝到Dish对象中的同名属性

        // 向菜品表插入1条记录
        dishMapper.insert(dish);

        // 获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors(); // 获取DishDto中的口味列表
        if (flavors != null && flavors.size() > 0) {
            // 给菜品的每个口味对应的菜品id赋值
            flavors.forEach(flavor -> {
                flavor.setDishId(dishId);
            });
            // 向口味表插入n条记录
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        // 判断菜品能否删除：1. 菜品是否在售中，在售则不能删除
        for(Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                // 当前商品在售中，无法删除，抛出异常
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 2. 菜品是否被套餐关联，关联则不能删除
        List<Long> setmealIds = setmealDishMapper.getSetmealDishIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0){
            // 当前套餐中含有相关菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 删除菜品表中的菜品记录
        // for (Long id : ids) {
        //     dishMapper.deleteById(id);
        //     // 删除口味表中关联的菜品口味记录
        //     dishFlavorMapper.deleteByDishId(id);
        // }

        // 优化
        // 根据菜品ids批量删除菜品
        dishMapper.deleteByIds(ids);

        // 根据菜品ids批量删除口味
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和口味
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        // 查询菜品数据
        Dish dish = dishMapper.getById(id);
        // 查询口味数据
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);
        // 封装VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(flavors);

        return dishVO;
    }

    /**
     * 根据id修改菜品和口味
     * @param dishDTO
     */
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        // 修改菜品
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        // 删除原有口味
        dishFlavorMapper.deleteByDishId(dish.getId());

        // 插入修改后的口味
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> {
                flavor.setDishId(dish.getId());
            });
            // 批量新增
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据菜品id修改菜品销售状态：启售/停售
     * @param status：1为起售，0为停售
     * @param id：菜品id
     */
    public void changeStatus(Integer status, Long id) {
        Dish dish = Dish.builder().id(id).status(status).build();
        dishMapper.update(dish);
    }

    /**
     * 根据分类id和菜品状态查询该分类下的菜品列表
     * @param dish：categoryId status
     * @return
     */
    public List<Dish> list(Dish dish) {
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}